Conventional character of the BCS-BEC cross-over in ultra-cold gases of 40K
arXiv:cond-mat/0501728 · doi:10.1103/PhysRevA.72.013610
Abstract
We use the standard fermionic and boson-fermion Hamiltonians to study the BCS-BEC cross-over near the 202 G resonance in a two-component mixture of fermionic 40K atoms employed in the experiment of C.A. Regal et al., Phys. Rev. Lett. 92, 040403 (2004). Our mean-field analysis of many-body equilibrium quantities shows virtually no differences between the predictions of the two approaches, provided they are both implemented in a manner that properly includes the effect of the highest excited bound state of the background scattering potential, rather than just the magnetic-field dependence of the scattering length. Consequently, we rule out the macroscopic occupation of the molecular field as a mechanism behind the fermionic pair condensation and show that the BCS-BEC cross-over in ultra-cold 40K gases can be analysed and understood on the same basis as in the conventional systems of solid state physics.
arXiv comment16 pages, 10 eps figures; final version
References in corpus (46)
- Observation of resonance condensation of fermionic atom pairs
- Condensation of Pairs of Fermionic Atoms Near a Feshbach Resonance
- Observation of Bose-Einstein Condensation of Molecules
- Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
- Experimental Study of the BEC-BCS Crossover Region in Lithium 6
- Evidence for Superfluidity in a Resonantly Interacting Fermi Gas
- Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
- Conversion of an Atomic Fermi Gas to a Long-Lived Molecular Bose Gas
- Resonance superfluidity in a quantum degenerate Fermi gas
- The BCS-BEC Crossover in a Gas of Fermi Atoms with a Feshbach Resonance
- High-precision calculations of dispersion coefficients, static dipole polarizabilities, and atom-wall interaction constants for alkali-metal atoms
- Prospect of creating a composite fermi/bose superfluid
- Resonant control of elastic collisions in an optically trapped Fermi gas of atoms
- BCS-BEC crossover at finite temperature for superfluid trapped Fermi atoms
- Bose condensation of cavity polaritons beyond the linear regime: the thermal equilibrium of a model microcavity
- Probing the excitation spectrum of a Fermi gas in the BCS-BEC crossover regime
- Collective modes of trapped gases at the BEC-BCS crossover
- Quantitative comparison between theoretical predictions and experimental results for the BCS-BEC crossover
- Pairing gap and in-gap excitations in trapped fermionic superfluids
- Transport equations including many-particle correlations for an arbitrary quantum system. General formalism
- Polariton condensation with localised excitons and propagating photons
- Achieving a BCS transition in an atomic Fermi gas
- Models of coherent exciton condensation
- Formation Time of a Fermion Pair Condensate
- A microscopic quantum dynamics approach to the dilute condensed Bose gas
- Resonance theory of the crossover from Bardeen-Cooper-Schrieffer superfluidity to Bose-Einstein condensation in a dilute Fermi gas
- Adiabatic association of ultracold molecules via magnetic field tunable interactions
- Microscopic theory of atom-molecule oscillations in a Bose-Einstein condensate
- The Nature of Superfluidity in Ultracold Fermi Gases Near Feshbach Resonances
- An effective theory of Feshbach resonances and many-body properties of Fermi gases
- Crossover temperature of Bose-Einstein condensation in an atomic Fermi gas
- Broad versus narrow Fano-Feshbach resonances in the BCS-BEC crossover with trapped Fermi atom
- Spectroscopy of Superfluid Pairing in Atomic Fermi Gases
- The nature of Feshbach molecules in Bose-Einstein condensates
- Momentum distribution of a trapped Fermi gas with large scattering length
- Feshbach resonance in dense ultracold Fermi gases
- BCS-BEC crossover with a finite-range interaction
- Coherent molecular bound states of bosons and fermions near a Feshbach resonance
- Resonance effects on the crossover of bosonic to fermionic superfluidity
- Shrinking of a condensed fermionic cloud in a trap approaching the BEC limit
- Phase diagrams for an ideal gas mixture of fermionic atoms and bosonic molecules
- Ground state of two-component degenerate fermionic gases
- Pair Wave Functions in Atomic Fermi Condensates
- Feshbach-Resonant Interactions in 40K and 6Li Degenerate Fermi Gases
- Heating and atom loss during upward ramps of Feshbach resonance levels in Bose-Einstein condensates
- Fermion-mediated BCS-BEC Crossover in Ultracold Potassium-40 Gases
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- Feshbach Resonances in Ultracold Gases
- Production of cold molecules via magnetically tunable Feshbach resonances
- Ultrafast many-body interferometry of impurities coupled to a Fermi sea
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- Field-theoretical study of the Bose polaron
- Universal many-body response of heavy impurities coupled to a Fermi sea
- Collective coherence in planar semiconductor microcavities
- The potential energy of a K Fermi gas in the BCS-BEC crossover
- Superfluid stability in BEC-BCS crossover
- Efimov physics beyond universality
- An impurity in a Fermi sea on a narrow Feshbach resonance: A variational study of the polaronic and dimeronic branches
- Universality in Phase Transitions for Ultracold Fermionic Atoms
- Analytic description of atomic interaction at ultracold temperatures II: Scattering around a magnetic Feshbach resonance
- A two-channel R-matrix analysis of magnetic field induced Feshbach resonances
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- Trimers in the resonant 2+1 fermionic problem on a narrow Feshbach resonance : Crossover from Efimovian to Hydrogenoid spectrum
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- High Sensitivity RF Spectroscopy of a Strongly-Interacting Fermi Gas
- Conditions of Low Dimensionality for Strongly Interacting Atoms Under a Transverse Trap
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- Pairing Symmetry in the Anisotropic Fermi Superfluid under p-wave Feshbach Resonance
- Probing Fermionic Condensates by Fast-Sweep Projection onto Feshbach Molecules
- Bogoliubov theory of Feshbach molecules in the BEC-BCS crossover
- Generalized Galitskii approach for the vertex function of a Fermi gas with resonant interaction
- Bose-Fermi Mixtures Near an Interspecies Feshbach Resonance: Testing a Non Equilibrium Approach
- Classification of zero-energy resonances by dissociation of Feshbach molecules
- Experimental realization of BCS-BEC crossover physics with a Fermi gas of atoms
- Adiabatic Phase Diagram of an Ultracold Atomic Fermi Gas with a Feshbach Resonance
- Observation of collectivity enhanced magnetoassociation of Li in the quantum degenerate regime
- Many-body dynamics of p-wave Feshbach molecule production: a mean-field approach
- From Narrow to Broad Feshbach Resonances: Condensate Fraction of Cooper Pairs and Preformed Molecules
- Acoustic attenuation rate in the Fermi-Bose model with a finite-range fermion-fermion interaction